Here are the current prices for the card where I am at (PH): 750ti - PhP 7000, 650ti Boost - PhP 7350, 660 - PhP 8700
As you can see, there is really not a lot of price difference between the 750ti and the 650ti Boost here and both are in stock. Funny enough, it is actually harder to find a 660 at local stores than a 650ti Boost.
Anyway, what I plan to do now is to buy a 660 if I could find one at a good price, and if I can't, buy a 750ti for the power savings. (Power rates just spiked really hard where I am at, and the lower consumption can probably pay off as another upgrade later). Thanks for all your help!